Amblyopia, otherwise known as lazy eye,[1] is a disorder of the visual system that is characterized by poor or indistinct vision in an eye that is otherwise physically normal, or out of proportion to associated structural abnormalities. It has been…
Amaurosis (Greek meaning darkening, dark, or obscure) is vision loss or weakness that occurs without an apparent lesion affecting the eye [1]. It may result from either a medical condition or from excess acceleration, as in flight. The term is…
Addison’s disease (also known as chronic adrenal insufficiency, hypocortisolism or hypocorticism) is a rare endocrine disorder in which the adrenal gland produces insufficient amounts of steroid hormones (glucocorticoids and often mineralocorticoids). It may develop in children as well as adults,…
Ascariasis is a human disease caused by the parasitic roundworm Ascaris lumbricoides. Perhaps as many as one quarter of the world’s people are infected[1], and ascariasis is particularly prevalent in tropical regions and in areas of poor hygiene. Other species…
Acromegaly (from Greek akros “extreme” or “extremities” and megalos “large” – extremities enlargement) is a syndrome that results when the pituitary gland produces excess growth hormone (hGH) after epiphyseal plate closure. A number of disorders may be affecting the pituitary…
Hypothyroidism is the disease state in humans and animals caused by insufficient production of thyroid hormone by the thyroid gland. Cretinism is a form of hypothyroidism found in infants. Causes of Hypothyroidism About three percent of the general population is…
Graves’ disease is a thyroid disorder characterized by goitre, exophthalmos, and hyperthyroidism. It is caused by an antibody-mediated auto-immune reaction as to form anti-TSH-Receptor antibody. However, the trigger for this reaction is still unknown. It is the most common cause…
A goitre (BrE), or goiter (AmE) (Latin struma), also called a bronchocele, is a swelling in the neck (just below the Adam’s apple or larynx) due to an enlarged thyroid gland. Classification of Goitre They are classified in different ways:…
Diabetes insipidus (DI) is a condition characterized by excretion of large amounts of severely diluted urine, which cannot be reduced when fluid intake is reduced. It denotes inability of the kidney to concentrate urine. DI is caused by a deficiency…
A bile duct is any of a number of long tube-like structures that carry bile. Bile, required for the digestion of food, is excreted by the liver into passages that carry bile toward the hepatic duct, which joins with the…